Title :
Microwave dielectric properties degradation of ceramic-polymer composites by electron irradiation
Author :
Gonzalez, M. ; Ibarra, A. ; Hodgson, E.R.
Author_Institution :
Mater. for Fusion Group, CIEMAT, Madrid, Spain
Abstract :
Composite materials with permittivities of the order of 10 and dielectric losses less than 0.001 are being developed as high-frequency substrates for telecommunication applications. Composites fabricated with a zirconium tin titanate ceramic filler dispersed inside of a thermoset epoxy-based polymer matrix have been studied at 12 GHz as a function of temperature (from 100 K to 473 K) and during electron irradiation on a 2-MeV Van der Graaff electron accelerator up to a total dose of 40 MGy. The results show a dielectric loss increase and permittivity decrease with increasing temperature, and a radiation induced dielectric degradation due to polymer structural changes.
Keywords :
ceramics; dielectric losses; disperse systems; electron beam effects; filled polymers; permittivity; polymer structure; satellite communication; tin compounds; zirconium compounds; 100 to 473 K; 12 GHz; 2 MeV; 40 MGy; ceramic-polymer composite degradation; composite fabrication; composite materials; dielectric losses; electron irradiation; electron radiation effects; high-frequency substrates; microwave dielectric properties; microwave frequencies; permittivity; polymer structural changes; radiation induced dielectric degradation; satellite sector; telecommunication applications; thermoset epoxy-based polymer matrix; van der Graaff electron accelerator; zirconium tin titanate ceramic filler dispersion; Composite materials; Degradation; Dielectric losses; Dielectric substrates; Electrons; Permittivity; Polymers; Temperature; Tin; Zirconium; Ceramic-polymer composites; dielectric measurements; electron radiation effects; microwave frequencies;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2004.842730
